Hi Aaron Meurer,
Thanks, it works!
Ronghai
在 2015年9月21日星期一 UTC+2下午8:16:20，Aaron Meurer写道：
>
> subs should only be used to replace sympy expressions with sympy
> expressions. To evaluate a sympy expression at a numpy array, you
> should lambdify() it first.
>
> In [10]: f0 = lambdify((a, b, c), f)
>
> In [12]: f0(array1, array2, array3)
> Out[12]: array([2, 1, 1])
>
> Aaron Meurer
>
> On Mon, Sep 21, 2015 at 1:01 PM, Ronghai Wu <csu.wu...@gmail.com
> <javascript:>> wrote:
> > Dear Sympy developers and users,
> >
> > Could anyone help me with the following problem:
> > substitute a, b, c by arrays in expression f = a*b*c. For example, I get
> > "ValueError: The truth value of an array with more than one element is
> > ambiguous" if running:
> > import sympy
> > import numpy
> > sympy.var('a,b,c')
> > f = a*b*c
> > array1 = numpy.random.randint(1,3,3)
> > array2 = numpy.random.randint(1,3,3)
> > array3 = numpy.random.randint(1,3,3)
> > f.subs([[a, array1], [b, array2], [c, array3]])
> >
> > Best Regards
> > Ronghai Wu
> >
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